(19)
(11) EP 0 292 329 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.07.1989 Bulletin 1989/29

(43) Date of publication A2:
23.11.1988 Bulletin 1988/47

(21) Application number: 88304650.0

(22) Date of filing: 23.05.1988
(51) International Patent Classification (IPC)4: B01D 35/00, B01D 33/00
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 21.05.1987 US 52780

(71) Applicant: WHATMAN INC.
Clifton, New Jersey 07014 (US)

(72) Inventors:
  • Savas, Peter George
    Concord Massachusetts 01742 (US)
  • Kiger, Virginia Shimer
    Old Bridge New Jersey 08857 (US)
  • Boudreau, Ronald Rene
    Fitchburg Massachusetts 01420 (US)

(74) Representative: SERJEANTS 
25, The Crescent King Street
Leicester, LE1 6RX
Leicester, LE1 6RX (GB)


(56) References cited: : 
   
       


    (54) Filtering device


    (57) A filtering device of the piston-cylinder type having a piston (P) and a cylinder (C) with reduced cross-sections (36) and (16) to create a pressurizable chamber to force all fluids within the closed end of the cylinder into the piston as the piston is urged toward the closed end of the cylin­der.







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